CN102367587B - Method for treating excessive carbonate in cyanogens-containing gold plating solution - Google Patents

Method for treating excessive carbonate in cyanogens-containing gold plating solution Download PDF

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Publication number
CN102367587B
CN102367587B CN201110360686.1A CN201110360686A CN102367587B CN 102367587 B CN102367587 B CN 102367587B CN 201110360686 A CN201110360686 A CN 201110360686A CN 102367587 B CN102367587 B CN 102367587B
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plating solution
gold plating
filter
filtrate
treating pond
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CN102367587A (en
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孙军艳
杨炜
盛强
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Tancheng Jiaming Chemical Co.,Ltd.
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Shaanxi University of Science and Technology
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Abstract

The invention discloses a method for treating excessive carbonate in a cyanogens-containing gold plating solution, wherein a chemical precipitation method is adopted to decrease the content of the carbonate in the gold plating solution. In the method, precipitators, such as barium hydroxide, barium cyanide, barium chloride and the like, are used for undergoing a chemical reaction with the excessive carbonate (with potassium carbonate as a major part) in the gold plating solution to generate barium carbonate and other substance precipitates, and the precipitates are filtered to decrease the content of the carbonate in the gold plating solution. According to the method, the precipitators, such as the barium hydroxide, the barium cyanide, the barium chloride and the like, can be used for effectively decreasing the content of the carbonate in the gold plating solution without influencing the performance of the plating solution; equipment is simple to operate, an operation process is easy to implement, and an operation method is low in cost; and compared with the traditional method for reducing the content of the carbonate by diluting the gold plating solution, the method disclosed by the invention can be used for effectively reducing gold losses and saving production cost.

Description

A kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate
Technical field
The present invention relates to a kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate.
Background technology
Gold-platedly refer to the gold very thin at the plated surface last layer of implements.Gold-plated by its process characteristic, there is cyanogen-less gold and contain gold-plated two kinds of cyanogen.Because prussiate is containing toxic, environment is had to certain pollution, country's restriction is used containing cyanogen electroplates.
But there is following advantages containing cyanogen is gold-plated:
The first, bath stability, anti-impurity ability are strong;
The second, coating densification, bright in color, tack are good, wear-resisting, excellent property;
Three, wastewater treatment is easy thoroughly, processing costs is cheap.
Therefore in the last hundred years, many cyanogen-less gold systems still cannot replace containing cyanogen gold-plated, especially, in national defense industry, still generally adopt containing cyanogen especially gold-plated.But cyanide solution for gold plating in use inevitably can produce carbonate, especially produces salt of wormwood, and salt of wormwood runs up to a certain degree, can produce following detrimentally affect to plating solution:
The first, coating crystallization is coarse, bonding force is poor;
The second, anode passivation, reduction electroplating efficiency;
Three, coating uniformity is poor, and surface quality reduces.
Therefore need to reduce in time salt of wormwood content in solution, but in cyanide solution for gold plating, salt of wormwood solubleness is high, cannot adopt cryoprecipitation to remove salt of wormwood, in traditional method, mostly adopt the method for dilution gold plating solution to reduce salt of wormwood content, and the method must be scrapped part gold plating solution, cause a large amount of losses of solution, production cost is very high.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate is provided.
For achieving the above object, the technical solution used in the present invention is:
Prepare two size to fits, clean treating pond A, B;
1) will be evacuated in treating pond A containing cyanogen gold plating solution, gold plating solution volume is no more than 2/3 for the treatment of pond A volume, then detects the content W containing salt of wormwood in cyanogen gold plating solution;
2) according to the consumption U of W calculating precipitation agent, then the precipitation agent that is U by total amount obtains precipitant solution with deionized water dissolving, described precipitation agent is analytically pure hydrated barta, barium cyanide or bariumchloride, and precipitant solution is added in the gold plating solution in treating pond A under constantly stirring;
3) precipitant solution adds rear stirring 1-2h completely, leaves standstill to precipitation and solution layering;
4) supernatant liquid is filtered successively with double medium filtration paper, filter cloth several times, filter the filtrate obtaining and pour in treating pond B;
5) by turbid lower floor for liquid double medium filtration paper, filter cloth filter successively, filter the filtrate that obtains and pour in treating pond B;
6) filtrate in described treating pond B is poured in plating bath, filtrate through adjusting, examination plating can put into production after qualified.
If the filtrate in described treating pond B does not have solid impurity, directly pour in plating bath, if there is solid impurity, with the filtration of single layer filter paper, then pour filtration gained filtrate into plating bath.
The precipitate with deionized water that remaining a small amount of turbid liquid and filtration obtain in described treating pond A is rinsed, is filtered 2-3 time, will filter gained filtrate and concentrate, reclaims for subsequent use, can reduce the loss of gold ion.
The precipitation that described filter paper, filter cloth and filtration obtain is poured sludge sump into after broken cyanide is processed.
Treatment process containing cyanogen gold plating solution excess carbon hydrochlorate of the present invention, adopt chemical precipitation method to reduce carbonate content in gold plating solution, the method utilizes carbonate (being mainly salt of wormwood) excessive in the precipitation agents such as hydrated barta, barium cyanide, bariumchloride and gold plating solution that chemical reaction occurs, generate the species precipitate such as barium carbonate, by sedimentation and filtration, to reduce the content of carbonate in gold plating solution, main chemical reactions is as follows:
Ba(CN) 2+K 2CO 3=BaCO 3↓+2KCN
Ba(OH) 2+K 2CO 3=BaCO 3↓+2KOH
BaCl 2+K 2CO 3=BaCO 3↓+2KCl
The present invention has following feature:
1, use the precipitation agents (particularly bariumchloride) such as hydrated barta, barium cyanide, bariumchloride can effectively reduce (the being mainly salt of wormwood) content of carbonate in gold plating solution and not affect plating solution performance;
2, operating equipment is simple, and operating process is easily implemented, and working method is with low cost;
3, in gained regeneration gold plating solution, retain without excess carbon hydrochlorate;
4, compared with the method that the present invention reduces carbonate content with existing dilution gold plating solution, can effectively reduce golden loss, save production cost.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
Certain electroplates gold plating solution 100L, and salt of wormwood content is 62g/L, and after processing, salt of wormwood content is reduced to 25g/L.
Prepare two size to fits, clean treating pond A, B;
1) will be evacuated in treating pond A containing cyanogen gold plating solution, gold plating solution volume is no more than 2/3 for the treatment of pond A volume, then detects the content W containing salt of wormwood in cyanogen gold plating solution;
2) according to the consumption U of W calculating precipitation agent, the precipitation agent that is then U by total amount obtains precipitant solution with deionized water dissolving, and described precipitation agent is analytically pure bariumchloride, and precipitant solution is added in the gold plating solution in treating pond A under constantly stirring;
3) precipitant solution adds rear stirring 1h completely, leaves standstill to precipitation and solution layering;
4) supernatant liquid is filtered successively with double medium filtration paper, filter cloth several times, filter the filtrate obtaining and pour in treating pond B;
5) by turbid lower floor for liquid double medium filtration paper, filter cloth filter successively, filter the filtrate that obtains and pour in treating pond B;
6) filtrate in described treating pond B is poured in plating bath, filtrate through adjusting, examination plating can put into production after qualified.If the filtrate in described treating pond B does not have solid impurity, directly pour in plating bath, if there is solid impurity, with the filtration of single layer filter paper, then pour filtration gained filtrate into plating bath.
The precipitate with deionized water that in described treating pond A, remaining a small amount of turbid liquid and filtration obtain is rinsed, is filtered 2 times, will filter gained filtrate and concentrate, reclaims for subsequent use.The precipitation that described filter paper, filter cloth and filtration obtain is poured sludge sump into after broken cyanide is processed.
According to traditional method dilution process, if salt of wormwood content is reduced to 25g/L, need to abolish 58L gold plating solution, calculate according to the Gold Content of 4.5g/L, need loss gold for 261g;
According to embodiment 1 method processing, need as calculated BaCl 2quality is about 6kg, does not need to scrap solution, causes golden loss to be about 0.3g/L in treating processes, closes 30g.
Two kinds of method contrasts, present method reduces golden loss approximately 50%, and saving gold is 261-30=231g, is roughly equal to 92400 yuan of Renminbi, deducts consumption medicine bariumchloride and other running stores and saves approximately 90000 yuan of Renminbi.
Embodiment 2
Certain electroplates gold plating solution 100L, and salt of wormwood content is 62g/L, and after processing, salt of wormwood content is reduced to 25g/L, needs as calculated Ba (CN) 2quality is about 5.2kg.
Prepare two size to fits, clean treating pond A, B;
1) will be evacuated in treating pond A containing cyanogen gold plating solution, gold plating solution volume is no more than 2/3 for the treatment of pond A volume, then detects the content W containing salt of wormwood in cyanogen gold plating solution;
2) according to the consumption U of W calculating precipitation agent, the precipitation agent that is then U by total amount obtains precipitant solution with deionized water dissolving, and described precipitation agent is analytically pure barium cyanide, and precipitant solution is added in the gold plating solution in treating pond A under constantly stirring;
3) precipitant solution adds rear stirring 2h completely, leaves standstill to precipitation and solution layering;
4) supernatant liquid is filtered successively with double medium filtration paper, filter cloth several times, filter the filtrate obtaining and pour in treating pond B;
5) by turbid lower floor for liquid double medium filtration paper, filter cloth filter successively, filter the filtrate that obtains and pour in treating pond B;
6) filtrate in described treating pond B is poured in plating bath, filtrate through adjusting, examination plating can put into production after qualified.If the filtrate in described treating pond B does not have solid impurity, directly pour in plating bath, if there is solid impurity, with the filtration of single layer filter paper, then pour filtration gained filtrate into plating bath.
The precipitate with deionized water that in described treating pond A, remaining a small amount of turbid liquid and filtration obtain is rinsed, filter 23, will filter gained filtrate and concentrate, reclaims for subsequent use.The precipitation that described filter paper, filter cloth and filtration obtain is poured sludge sump into after broken cyanide is processed.
Embodiment 3
Certain electroplates gold plating solution 100L, and salt of wormwood content is 62g/L, and after processing, salt of wormwood content is reduced to 25g/L, needs as calculated Ba (OH) 2quality is about 4.6kg.
Prepare two size to fits, clean treating pond A, B;
1) will be evacuated in treating pond A containing cyanogen gold plating solution, gold plating solution volume is no more than 2/3 for the treatment of pond A volume, then detects the content W containing salt of wormwood in cyanogen gold plating solution;
2) according to the consumption U of W calculating precipitation agent, the precipitation agent that is then U by total amount obtains precipitant solution with deionized water dissolving, and described precipitation agent is analytically pure hydrated barta, and precipitant solution is added in the gold plating solution in treating pond A under constantly stirring;
3) precipitant solution adds rear stirring 1.5h completely, leaves standstill to precipitation and solution layering;
4) supernatant liquid is filtered successively with double medium filtration paper, filter cloth several times, filter the filtrate obtaining and pour in treating pond B;
5) by turbid lower floor for liquid double medium filtration paper, filter cloth filter successively, filter the filtrate that obtains and pour in treating pond B;
6) filtrate in described treating pond B is poured in plating bath, filtrate through adjusting, examination plating can put into production after qualified.If the filtrate in described treating pond B does not have solid impurity, directly pour in plating bath, if there is solid impurity, with the filtration of single layer filter paper, then pour filtration gained filtrate into plating bath.
The precipitate with deionized water that in described treating pond A, remaining a small amount of turbid liquid and filtration obtain is rinsed, filter 23, will filter gained filtrate and concentrate, reclaims for subsequent use.The precipitation that described filter paper, filter cloth and filtration obtain is poured sludge sump into after broken cyanide is processed.
Adopt different precipitation agents to carry out understanding and producing different by products in processes of carbonate treatment engineering, the precipitation agent of amount needs and the by product of generation that precipitate as required carbonate are simultaneously also different, contain KAu (CN) in cyanide solution for gold plating 2, KCN, KOH, K 2cO 3, in the time selecting precipitation agent, can select Ba (CN) 2, BaCl 2, Ba (OH) 2in cyaniding, chlorination, oxyhydroxide, the by product producing is respectively KCN, KCl, KOH, owing to itself containing KCN and KOH in solution, and two kinds of compositions have certain processing range, play an important role stablizing on plating solution and quality of coating, introduce in a large number KCN and KOH and can cause plating solution out of proportion, need to readjust plating solution, and KCl only increases the electroconductibility of solution in solution, do not affect quality of coating.

Claims (4)

1. containing a treatment process for cyanogen gold plating solution excess carbon hydrochlorate, it is characterized in that: comprise the following steps:
1) will be evacuated in treating pond A containing cyanogen gold plating solution, gold plating solution volume is no more than 2/3 for the treatment of pond A volume, then detects the content W of salt of wormwood in gold plating solution;
2) according to W and ensure that in gold plating solution, salt of wormwood content is reduced to 25g/L, calculate the consumption U of precipitation agent, then the precipitation agent that is U by total amount obtains precipitant solution with deionized water dissolving, described precipitation agent is analytically pure hydrated barta, barium cyanide or bariumchloride, and precipitant solution is added in the gold plating solution in treating pond A under constantly stirring;
3) precipitant solution adds rear stirring 1-2h, leaves standstill to precipitation and solution layering;
4) double medium filtration paper, filter cloth for supernatant liquid are filtered successively, filter the filtrate obtaining and pour in treating pond B;
5) by turbid lower floor for liquid double medium filtration paper, filter cloth filter successively, filter the filtrate that obtains and pour in treating pond B;
6) filtrate in described treating pond B is poured in plating bath, filtrate through adjusting, examination plating puts into production after qualified.
2. a kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate according to claim 1, it is characterized in that: if the filtrate in described treating pond B does not have solid impurity, pour in plating bath, if there is solid impurity, with the filtration of single layer filter paper, then pour filtration gained filtrate into plating bath.
3. according to a kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate described in claim 1 or 2, it is characterized in that: the precipitate with deionized water that in described treating pond A, remaining turbid liquid and filtration obtain is rinsed, filtered 2-3 time, will filter gained filtrate and concentrate, reclaims for subsequent use.
4. a kind for the treatment of process containing cyanogen gold plating solution excess carbon hydrochlorate according to claim 3, is characterized in that: the precipitation that described filter paper, filter cloth and filtration obtain is poured sludge sump into after broken cyanide is processed.
CN201110360686.1A 2011-11-15 2011-11-15 Method for treating excessive carbonate in cyanogens-containing gold plating solution Active CN102367587B (en)

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JP6093232B2 (en) * 2013-04-24 2017-03-08 田中貴金属工業株式会社 Valuable metal recovery method
CN107326409A (en) * 2017-06-27 2017-11-07 中国人民解放军第五七九工厂 A kind of method for removing carbonate in cyaniding plant of silver tank liquor

Citations (1)

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CN101736391A (en) * 2010-01-22 2010-06-16 青岛大学 Method for removing excessive citrate contained in gold-plating solution

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Publication number Priority date Publication date Assignee Title
CN101736391A (en) * 2010-01-22 2010-06-16 青岛大学 Method for removing excessive citrate contained in gold-plating solution

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Patentee after: Tancheng Jiaming Chemical Co.,Ltd.

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Patentee before: SHAANXI University OF SCIENCE & TECHNOLOGY

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